Nakrak Sukanya, Tontiwachwuthikul Paitoon, Gao Hongxia, Liang Zhiwu, Sema Teerawat
Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Pathumwan, Bangkok, 10330, Thailand.
Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Pathumwan, Bangkok, 10330, Thailand.
Environ Sci Pollut Res Int. 2023 Jan;30(4):10001-10023. doi: 10.1007/s11356-022-22819-x. Epub 2022 Sep 6.
Mass transfer of CO absorption in 2-amino-2-methyl-1-propanol (AMP) - piperazine (PZ) - monoethanolamine (MEA) was statistically investigated in terms of overall mass transfer coefficient ([Formula: see text]) and CO removal percentage. The parameters of interest were lean solvent flux (A), rich gas flux (B), CO loading in the lean solvent (C), and ratio of the sampling height to the total column height [Formula: see text] (D). From ANOVA, A was the most impactable parameter on both responses with three-quarters of the overall contribution. Regarding the three-level factorial design, a second-order polynomial increasing trend of [Formula: see text] was observed as C and/or D increased. Additionally, [Formula: see text] linearly increased as A increased but was not affected by B. On the other hand, the CO removal percentage linearly increased as A and/or D increased but linearly decreased as B and/or C increased. Surface analysis suggested the optimum condition for both responses at a high level of A, low level of B, low level of C, and middle level of D. In this work, D was statistically investigated and included in the predictive correlation for [Formula: see text] for the first time. The main advantage of the proposed correlation over the recently reported correlations was that it did not require a measurement of CO partial pressure along the column height. For each amine component in the blend, (i) AMP played a positive key role in cyclic capacity and solvent regeneration duty, (ii) PZ enhanced transfer rate, and (iii) MEA elevated total amine concentration. As a result, 1.5:1.5:3 was recommended due to (i) elevations of 68.2% [Formula: see text], 14% CO removal percentage, 15.1% absorption capacity, and 66.7% cyclic capacity and (ii) reduction of 50% regeneration duty compared with 5 M MEA. With respect to the other literature-reported solvents, AMP-PZ-MEA is very competitive in terms of transfer coefficient, cyclic capacity, and solvent regeneration heat duty.
从总传质系数（[公式：见正文]）和CO脱除率方面，对2-氨基-2-甲基-1-丙醇（AMP）-哌嗪（PZ）-单乙醇胺（MEA）中CO吸收的传质进行了统计研究。感兴趣的参数有贫溶剂通量（A）、富气通量（B）、贫溶剂中的CO负载量（C）以及采样高度与塔总高度的比值[公式：见正文]（D）。通过方差分析，A是对两个响应影响最大的参数，总体贡献达四分之三。对于三级析因设计，随着C和/或D的增加，观察到[公式：见正文]呈二阶多项式上升趋势。此外，[公式：见正文]随A的增加呈线性增加，但不受B的影响。另一方面，CO脱除率随A和/或D的增加呈线性增加，但随B和/或C的增加呈线性下降。表面分析表明，在A处于高水平、B处于低水平、C处于低水平且D处于中等水平时，两个响应均处于最佳条件。在这项工作中，首次对D进行了统计研究并将其纳入[公式：见正文]的预测关联式中。所提出的关联式相对于最近报道的关联式的主要优点在于，它不需要沿塔高测量CO分压。对于混合中的每种胺组分，（i）AMP在循环容量和溶剂再生负荷方面起积极关键作用，（ii）PZ提高传质速率，（iii）MEA提高总胺浓度。结果，推荐采用1.5:1.5:3的比例，原因如下：（i）[公式：见正文]提高68.2%，CO脱除率提高14%，吸收容量提高15.1%，循环容量提高66.7%；（ii）与5M MEA相比，再生负荷降低50%。相对于其他文献报道的溶剂，AMP - PZ - MEA在传质系数、循环容量和溶剂再生热负荷方面具有很强的竞争力。
